CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Apr. 30, 2015	Apr. 30, 2014
Net revenue:
License and other	$ 326.7us-gaap_LicenseAndServicesRevenue	$ 316.2us-gaap_LicenseAndServicesRevenue
Subscription	319.8us-gaap_SubscriptionRevenue	276.3us-gaap_SubscriptionRevenue
Total net revenue	646.5us-gaap_SalesRevenueNet	592.5us-gaap_SalesRevenueNet
Cost of revenue:
Cost of license and other revenue	53.1us-gaap_LicenseCosts	49.3us-gaap_LicenseCosts
Cost of subscription revenue	38.7us-gaap_CostOfGoodsSoldSubscription	29.4us-gaap_CostOfGoodsSoldSubscription
Total cost of revenue	91.8us-gaap_CostOfRevenue	78.7us-gaap_CostOfRevenue
Gross profit	554.7us-gaap_GrossProfit	513.8us-gaap_GrossProfit
Operating expenses:
Marketing and sales	253.9us-gaap_SellingAndMarketingExpense	225.4us-gaap_SellingAndMarketingExpense
Research and development	194.5us-gaap_ResearchAndDevelopmentExpense	170.5us-gaap_ResearchAndDevelopmentExpense
General and administrative	75.9us-gaap_GeneralAndAdministrativeExpense	62.5us-gaap_GeneralAndAdministrativeExpense
Amortization of purchased intangibles	8.9us-gaap_AmortizationOfIntangibleAssets	10.9us-gaap_AmortizationOfIntangibleAssets
Restructuring charges, net	0us-gaap_RestructuringCharges	2.3us-gaap_RestructuringCharges
Total operating expenses	533.2us-gaap_OperatingExpenses	471.6us-gaap_OperatingExpenses
Income from operations	21.5us-gaap_OperatingIncomeLoss	42.2us-gaap_OperatingIncomeLoss
Interest and other income (expense), net	0.3us-gaap_InterestIncomeExpenseNet	(6.6)us-gaap_InterestIncomeExpenseNet
Income before income taxes	21.8	35.6
Provision for income taxes	(2.7)us-gaap_IncomeTaxExpenseBenefit	(7.3)us-gaap_IncomeTaxExpenseBenefit
Net income	$ 19.1us-gaap_NetIncomeLoss	$ 28.3us-gaap_NetIncomeLoss
Basic net income per share (in usd per share)	$ 0.08us-gaap_EarningsPerShareBasic	$ 0.12us-gaap_EarningsPerShareBasic
Diluted net income per share (in usd per share)	$ 0.08us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted
Weighted average shares used in computing basic net income per share (shares)	227.2	227.0
Weighted average shares used in computing diluted net income per share (shares)	231.7	231.6

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